Brake-shoe.



J. J. KINZER.

7 BRAKE SHOE.

APPLICATION FILED MAY 2. 1913.

1,094,220. Patented Apr. 21, 1914.

Irwen'tar:

COLUMBIA PLANOGRAPH conwAsli muToN. n. o

UNITED v STATES PATENT OFFICE.

JOHN JACOB KINZER, OF VJILDWOOD, PENNSYLVANIA, ASSIGNOR TO PITTSBURG- BRAKE SHOE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

BRAKE-SHOE.

Tod/Z whom it may concern Be it known that I, JOHN JACOB Knvznn, a citizen of the United States, and a resident of Wildwood, in the county of Allegheny and State of Pennsylvania, have in vented a new and useful Improvement in Brake-Shoes, and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to brake shoes and has special reference to brake shoes for use with railway car wheels and such a class of shoes in which the outer casing of the same is composed of ductile material and is filled To enable others skilled in the art to which my invention appertains to manufacture and use my improved brake shoe, I will describe the same more fully referring to the accompanying drawing, in which Figure 1 is a side elevation of my improved brake shoe. Fig. 2 is a top plan view of the same. Fig. 3 is a bottom plan view of the same. Fig. 4: is a cross-sectional view of the shoe on the line 4-4, Fig. 1.

Like symbols of reference herein indicate like parts in each of the figures of the draw- 1n T-Ieretofore in the manufacture of brake shoes for car wheels the molded casing of the same has had its sides made straight and this casing has then been filled with a composition of frictional material for bearing on the tread periphery of the car wheel. This straight sided casing is very objectionable in that the said sides present straight lines of wearing surface against the tread of the wheel and thus tend to wear or cut grooves around the same so that such wheel is very soon spoiled and has to be removed from the car. This cutting and wearing is produced principally by the fact Specification of Letters Patent.

Application filed May 2, 1913.

Patented Apr. 21, 1914. Serial No. 765,120.

that small particles of the cast metal casing are torn from the bearing edges of the sides of the casing and these particles will drag for a fraction of an inch and will then adhere to some other point on the bearing edge and will score and wear the tread of the wheel on account of such wearing surface being continuous.

As illustrated in the drawing my im proved brake shoe consists of a casing F which is cast from some strong and ductile material such as cast malleable iron or cast steel, and such casing is curved as shown in Fig. 1 in order to conform to the periphery of the car wheel, while the back 2 of said casing is also curved in order to make a uniform cross section throughout the length of the shoe.

' The back 2 of the casing 1 is provided with a lug 3 which is located at the center of the same and is box-like in form with its sides 1 tapering slightly toward the back 2. This lug 3 is provided with openings 5 in the sides 4 of the same for connecting the shoe to the usual apparatus (not shown). The back 2 of the casing 1 is further provided with a rib 6 at each end of the same and with an extension 7'at the center of each of said ribs for providing means whereby said shoe can be held in position on the hanger. The ends 8 which are formed integral with the back 2 of said casing are straight and extend the same depth as the composition a within the casing while the sides 9 which are also formed integral with said back and ends are provided with a series of corrugations 10 throughout the length of the same as later explained. These corrugations 10 are semi-pyramidal in shape having their largest depression 11 on the wearing edge of the casing and tapering upward to the top of the side 9 where they disappear in a point 12.

Fig. 1 shows a section through the center of the corrugations 10 and the inner and outer vertices 13 and 14: respectively. The corrugations 10 will thus form a wedge for the frictional composition a within the easing 1 and such casing will be strong and durable by reason of its being composed of ductile material while the particles which are torn from the wearing surface of the same by contact with the car wheel will not be dragged along a continuous wearing surface and thus cut and injure the tread of scratch and score the tread of the wheeL.

In forming the soft and ductile casing in this manner with the semi-pyramidal corrugations the use of such material becomes practical for brake shoe casings, while heretofore it has been prohibitive on account of the straight sides of the same having a tendency to drag along the face of the wheel and thus scratch, score or cut the same so as to destroy the wheel and this is particularly true with steel wheels where the particles of steel drag between the straight sides of the casing and the tread periphery of such wheel.

In theuse of my improved brake shoe the V-shaped corrugations will present a broken line of contact between the same and the tread of the wheel and on account of the peculiar shape of the corrugations the shoe can be entirely Worn down without injuring the fwheel.

Various modifications and changes in the design and useof my improved brake shoe may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages. I 7

What I claim as my invention and desire to secure by Letters Patent, is

l. A brake shoe comprising an inclosing casing of cast metal having integral back, end and side walls, said side walls being provided with semi-pyramidal shaped corrugations, and a filling of frictional material within said casing.

2. A brake shoe comprising an inclosing casing of cast metal having integral back, end and side walls, a lug on the back of said casing formed integral therewith said side walls being provided with semipyramidal shaped corrugations, and a filling of frictional material within said casing.

3. A brake shoe comprising an inclosing casing of cast malleable metal having integral back, end and side walls, said side walls being provided With semi-pyramidal shaped corrugations, and a filling of frictional material within said casing.

at. A brake shoe comprising an inclosing casingof cast malleable metal having integral back, end and side walls, a lug on the back of said casing formed integral therewith said side walls being provided with semi-pyramidal shaped corrugations, and a filling of frictional material within said casing.

In testimony whereof, I the said JOHN JACOB Kmznn, have hereunto set my hand.

JOHN JACOB KINZER.

Witnesses:

T. B. HUMrimIEs,

J. N. CooKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

Washington, .D. C. 

